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为研究柴油机受限空间燃烧室内喷雾液滴撞壁特性,采用流体体积法,并考虑传热及接触热阻作用,建立了液滴撞壁模型,并开展液滴撞壁数值研究,揭示了液滴撞壁微细流动传热机理。结果表明:液滴直径越大,液滴最大铺展系数越大,但液滴达到最大铺展系数所需无量纲时间与液滴直径不相关;液滴铺展系数与接触角不相关,且液滴达到最大铺展系数所需无量纲时间与接触角不相关;液滴最大铺展系数与液滴直径的平方近似线性递增;液滴最大铺展系数与雷诺数和韦伯数近似线性递增。
In order to study the characteristics of spray droplet wall in a combustion chamber with limited space of diesel engine, a droplet wall model was established by considering the heat transfer and the thermal contact resistance. The numerical study of the droplet wall was carried out. Droplet wall micro-flow heat transfer mechanism. The results show that the larger the droplet diameter is, the larger the droplet spreading coefficient is. However, the dimensionless time required for the droplet to reach the maximum spreading factor is not related to the droplet diameter. The droplet spreading factor is not related to the contact angle and the droplet reaches The dimensionless time required by the maximum spreading factor is not related to the contact angle. The maximum spreading coefficient of droplets and the square of droplet diameter increase approximately linearly. The maximum spreading coefficient of droplet increases linearly with Reynolds number and Weber number.